11 Mar '17, 5pm

This #battery-powered device can measure #cardiac activity and bioimpedance:

This #battery-powered device can measure #cardiac activity and bioimpedance:

When Marcus Yip and Professor Anantha Chandrakasan of MIT presented an A/D converter design for biosensing applications at the 2011 International Solid State Circuits Conference (ISSCC), a key target was flexibility, as the biopotentials used to measure heart and brain signals vary widely in bandwidth and dynamic range. Their approach was to implement the converter using reconfigurable hardware so resolution and speed could be changed ‘on the fly’. Although programmable gain amplifiers on the front-end can help boost effective range, reconfigurability makes it possible to tune power efficiency. In order to compare efficiencies among converters with different resolutions and sample rates, circuit designers tend to use the metric of energy per conversion step. Less than 100fJ/step is generally a good result for a modern process and novel techniques have seen researchers push...

Full article: http://www.newelectronics.co.uk/electronics-technology/sa...

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